4 ideas
A serious six-year-old city boy, nicknamed 'Uncle Fyodor' for his gravity, is forbidden by his mother to keep a talking cat named Matroskin. His parents find him only when they place a newspaper notice and the village postman recognizes him.
The postman Pechkin is suspicious, officious and nosy, demanding papers and interfering in everyone's business. The book treats chronic bad temper as a sign of a specific, satisfiable frustration rather than a fixed trait.
Matroskin tells Uncle Fyodor he is eating his sandwich wrong: with the sausage underneath, it touches the tongue first and tastes better. The advice questions a habit nobody notices by asking what the habit is for, which here is taste, and then flipping it to serve that aim directly.
Matroskin runs the house like a small farm economy. He wants a cow for milk, counts every expense, and notes that to sell something unneeded you must first buy something unneeded, which requires money you don't have. Seeing a household as a system of inputs, outputs and capital lets a child's home become a working enterprise, not a place kept going by parents.